The Canadian suffered a 6-0, 5-7, 6-2 loss to Swiss Belinda Bencic in the opening round in Toronto as Bouchard fell at the first hurdle for the eighth time in her last 10 tournaments.
Bouchard reached a career high five in the world rankings last year after finishing as the Wimbledon runner-up and securing two further Grand Slam semi-final appearances, but she has not managed to replicate that kind of form in 2015.
The 21-year-old did manage a quarter-final spot in the Australian Open but fell in the first round at both the French Open and Wimbledon, but Bouchard remains upbeat and insists her performances are improving.
"It's for sure a step in the right direction," Bouchard told reporters.
"I feel like I started out a little bit rusty in a sense. Haven't had a lot of match play recently, but I was able to raise my game and I think it was pretty competitive out there after that first set.
"So I'm pleased with my performance."
She added: "I'm looking forward to the rest of the year as a chance to end the year on a better note than I started. I feel like I have some tournaments left.
"I just want to get on the court. I'm so eager to play tournaments, play matches and feel good."
Bouchard, who is currently ranked as the world number 25, is 40/1 to win the US Open at Flushing Meadows, while British hopeful Heather Watson can be backed at 125/1.